Acer AT350 F1 - Manual (Page 41)

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5 Slide the side panel toward the rear of the server to disengage it
then lift the panel away from the server (3).
Installing the side panel
1 Observe the pre-installation instructions described on page 26.
2 Position the side panel so that the tabs on the cover align with the
slots on the server, then slide the side panel toward the front of
the server until you hear a click sound.
3 Replace the two screws.